mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

I had to change buffer tag: now RelFileNode is used instead of

Browse Source 
LockRelId - ie physical information, not logical. It's required
for WAL. Regression tests passed.
This commit is contained in:
Vadim B. Mikheev 2000-10-18 05:50:16 +00:00
parent 8b6b414a5e
commit 2e6358172f
6 changed files with 156 additions and 243 deletions

8
src/backend/storage/buffer/buf_init.c

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_init.c,v 1.35 2000/05/31 00:28:26 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_init.c,v 1.36 2000/10/18 05:50:15 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -67,8 +67,9 @@ long *PrivateRefCount; /* also used in freelist.c */
bits8 *BufferLocks; /* flag bits showing locks I have set */
BufferTag *BufferTagLastDirtied; /* tag buffer had when last
* dirtied by me */
BufferBlindId *BufferBlindLastDirtied; /* and its BlindId too */
bool *BufferDirtiedByMe; /* T if buf has been dirtied in cur xact */
BufferBlindId *BufferBlindLastDirtied;
LockRelId *BufferRelidLastDirtied;
bool *BufferDirtiedByMe; /* T if buf has been dirtied in cur xact */
/*
@ -251,6 +252,7 @@ InitBufferPool(IPCKey key)
BufferLocks = (bits8 *) calloc(NBuffers, sizeof(bits8));
BufferTagLastDirtied = (BufferTag *) calloc(NBuffers, sizeof(BufferTag));
BufferBlindLastDirtied = (BufferBlindId *) calloc(NBuffers, sizeof(BufferBlindId));
BufferRelidLastDirtied = (LockRelId *) calloc(NBuffers, sizeof(LockRelId));
BufferDirtiedByMe = (bool *) calloc(NBuffers, sizeof(bool));
}

6
src/backend/storage/buffer/buf_table.c

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_table.c,v 1.17 2000/05/19 03:22:28 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_table.c,v 1.18 2000/10/18 05:50:15 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -125,8 +125,8 @@ BufTableDelete(BufferDesc *buf)
* sequential searches through the buffer table won't think the
* buffer is still valid for its old page.
*/
buf->tag.relId.relId = InvalidOid;
buf->tag.relId.dbId = InvalidOid;
buf->tag.rnode.relNode = InvalidOid;
buf->tag.rnode.tblNode = InvalidOid;
return TRUE;
}

313
src/backend/storage/buffer/bufmgr.c

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.86 2000/10/16 14:52:09 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.87 2000/10/18 05:50:15 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -116,13 +116,10 @@ RelationGetBufferWithBuffer(Relation relation,
{
if (!BufferIsLocal(buffer))
{
LockRelId *lrelId = &relation->rd_lockInfo.lockRelId;
bufHdr = &BufferDescriptors[buffer - 1];
SpinAcquire(BufMgrLock);
if (bufHdr->tag.blockNum == blockNumber &&
bufHdr->tag.relId.relId == lrelId->relId &&
bufHdr->tag.relId.dbId == lrelId->dbId)
RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node))
{
SpinRelease(BufMgrLock);
return buffer;
@ -132,8 +129,8 @@ RelationGetBufferWithBuffer(Relation relation,
else
{
bufHdr = &LocalBufferDescriptors[-buffer - 1];
if (bufHdr->tag.relId.relId == RelationGetRelid(relation) &&
bufHdr->tag.blockNum == blockNumber)
if (bufHdr->tag.blockNum == blockNumber &&
RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node))
return buffer;
}
}
@ -614,9 +611,7 @@ BufferAlloc(Relation reln,
/* record the database name and relation name for this buffer */
strcpy(buf->blind.dbname, DatabaseName);
strcpy(buf->blind.relname, RelationGetPhysicalRelationName(reln));
#ifndef OLD_FILE_NAMING
buf->blind.rnode = reln->rd_node;
#endif
buf->relId = reln->rd_lockInfo.lockRelId;
INIT_BUFFERTAG(&(buf->tag), reln, blockNum);
if (!BufTableInsert(buf))
@ -703,59 +698,6 @@ refcount = %ld, file: %s, line: %d\n",
#endif
/*
* DirtyBufferCopy() -- For a given dbid/relid/blockno, if the buffer is
* in the cache and is dirty, mark it clean and copy
* it to the requested location. This is a logical
* write, and has been installed to support the cache
* management code for write-once storage managers.
*
* DirtyBufferCopy() -- Copy a given dirty buffer to the requested
* destination.
*
* We treat this as a write. If the requested buffer is in the pool
* and is dirty, we copy it to the location requested and mark it
* clean. This routine supports the Sony jukebox storage manager,
* which agrees to take responsibility for the data once we mark
* it clean.
*
* NOTE: used by sony jukebox code in postgres 4.2 - ay 2/95
*/
#ifdef NOT_USED
void
DirtyBufferCopy(Oid dbid, Oid relid, BlockNumber blkno, char *dest)
{
BufferDesc *buf;
BufferTag btag;
btag.relId.relId = relid;
btag.relId.dbId = dbid;
btag.blockNum = blkno;
SpinAcquire(BufMgrLock);
buf = BufTableLookup(&btag);
if (buf == (BufferDesc *) NULL
|| !(buf->flags & BM_DIRTY)
|| !(buf->flags & BM_VALID))
{
SpinRelease(BufMgrLock);
return;
}
/*
* hate to do this holding the lock, but release and reacquire is
* slower
*/
memmove(dest, (char *) MAKE_PTR(buf->data), BLCKSZ);
buf->flags &= ~BM_DIRTY;
SpinRelease(BufMgrLock);
}
#endif
/*
* FlushBuffer -- like WriteBuffer, but force the page to disk.
*
@ -783,10 +725,10 @@ FlushBuffer(Buffer buffer, bool release)
bufHdr = &BufferDescriptors[buffer - 1];
bufdb = bufHdr->tag.relId.dbId;
bufdb = bufHdr->relId.dbId;
Assert(bufdb == MyDatabaseId || bufdb == (Oid) NULL);
bufrel = RelationIdCacheGetRelation(bufHdr->tag.relId.relId);
bufrel = RelationIdCacheGetRelation(bufHdr->relId.relId);
Assert(bufrel != (Relation) NULL);
@ -954,8 +896,7 @@ SetBufferDirtiedByMe(Buffer buffer, BufferDesc *bufHdr)
*/
if (BufferDirtiedByMe[buffer - 1])
{
if (bufHdr->tag.relId.dbId == tagLastDirtied->relId.dbId &&
bufHdr->tag.relId.relId == tagLastDirtied->relId.relId &&
if (RelFileNodeEquals(bufHdr->tag.rnode, tagLastDirtied->rnode) &&
bufHdr->tag.blockNum == tagLastDirtied->blockNum)
return; /* Same tag already dirtied, so no work */
@ -963,25 +904,17 @@ SetBufferDirtiedByMe(Buffer buffer, BufferDesc *bufHdr)
SpinRelease(BufMgrLock);
#endif /* OPTIMIZE_SINGLE */
reln = RelationIdCacheGetRelation(tagLastDirtied->relId.relId);
reln = RelationIdCacheGetRelation(BufferRelidLastDirtied[buffer - 1].relId);
if (reln == (Relation) NULL)
{
#ifdef OLD_FILE_NAMING
status = smgrblindmarkdirty(DEFAULT_SMGR,
BufferBlindLastDirtied[buffer - 1].dbname,
BufferBlindLastDirtied[buffer - 1].relname,
tagLastDirtied->relId.dbId,
tagLastDirtied->relId.relId,
tagLastDirtied->rnode,
tagLastDirtied->blockNum);
#else
status = smgrblindmarkdirty(DEFAULT_SMGR,
BufferBlindLastDirtied[buffer - 1].rnode,
tagLastDirtied->blockNum);
#endif
}
else
{
Assert(RelFileNodeEquals(tagLastDirtied->rnode, reln->rd_node));
status = smgrmarkdirty(DEFAULT_SMGR, reln,
tagLastDirtied->blockNum);
@ -1005,6 +938,7 @@ SetBufferDirtiedByMe(Buffer buffer, BufferDesc *bufHdr)
}
*tagLastDirtied = bufHdr->tag;
BufferRelidLastDirtied[buffer - 1] = bufHdr->relId;
BufferBlindLastDirtied[buffer - 1] = bufHdr->blind;
BufferDirtiedByMe[buffer - 1] = true;
}
@ -1028,10 +962,9 @@ ClearBufferDirtiedByMe(Buffer buffer, BufferDesc *bufHdr)
* the data we just wrote. This is unlikely, but possible if some
* other backend replaced the buffer contents since we set our flag.
*/
if (bufHdr->tag.relId.dbId == tagLastDirtied->relId.dbId &&
bufHdr->tag.relId.relId == tagLastDirtied->relId.relId &&
bufHdr->tag.blockNum == tagLastDirtied->blockNum)
BufferDirtiedByMe[buffer - 1] = false;
if (RelFileNodeEquals(bufHdr->tag.rnode, tagLastDirtied->rnode) &&
bufHdr->tag.blockNum == tagLastDirtied->blockNum)
BufferDirtiedByMe[buffer - 1] = false;
}
/*
@ -1074,15 +1007,10 @@ BufferSync()
didwrite = false;
if ((bufHdr->flags & BM_VALID) && (bufHdr->flags & BM_DIRTY))
{
Oid bufdb;
Oid bufrel;
bufdb = bufHdr->tag.relId.dbId;
bufrel = bufHdr->tag.relId.relId;
if (bufdb == BufferTagLastDirtied[i].relId.dbId &&
bufrel == BufferTagLastDirtied[i].relId.relId &&
if (RelFileNodeEquals(bufHdr->tag.rnode, BufferTagLastDirtied[i].rnode) &&
bufHdr->tag.blockNum == BufferTagLastDirtied[i].blockNum)
{
Oid bufrel = bufHdr->relId.relId;
/*
* Try to find relation for buf. This could fail, if the
@ -1147,24 +1075,16 @@ BufferSync()
*/
if (reln == (Relation) NULL)
{
#ifdef OLD_FILE_NAMING
status = smgrblindwrt(DEFAULT_SMGR,
bufHdr->blind.dbname,
bufHdr->blind.relname,
bufdb, bufrel,
bufHdr->tag.rnode,
bufHdr->tag.blockNum,
(char *) MAKE_PTR(bufHdr->data),
true); /* must fsync */
#else
status = smgrblindwrt(DEFAULT_SMGR,
bufHdr->blind.rnode,
bufHdr->tag.blockNum,
(char *) MAKE_PTR(bufHdr->data),
true); /* must fsync */
#endif
}
else
{
Assert(RelFileNodeEquals(reln->rd_node,
BufferTagLastDirtied[i].rnode));
status = smgrwrite(DEFAULT_SMGR, reln,
bufHdr->tag.blockNum,
(char *) MAKE_PTR(bufHdr->data));
@ -1218,24 +1138,17 @@ BufferSync()
SpinRelease(BufMgrLock);
#endif /* OPTIMIZE_SINGLE */
reln = RelationIdCacheGetRelation(BufferTagLastDirtied[i].relId.relId);
reln = RelationIdCacheGetRelation(BufferRelidLastDirtied[i].relId);
if (reln == (Relation) NULL)
{
#ifdef OLD_FILE_NAMING
status = smgrblindmarkdirty(DEFAULT_SMGR,
BufferBlindLastDirtied[i].dbname,
BufferBlindLastDirtied[i].relname,
BufferTagLastDirtied[i].relId.dbId,
BufferTagLastDirtied[i].relId.relId,
BufferTagLastDirtied[i].rnode,
BufferTagLastDirtied[i].blockNum);
#else
status = smgrblindmarkdirty(DEFAULT_SMGR,
BufferBlindLastDirtied[i].rnode,
BufferTagLastDirtied[i].blockNum);
#endif
}
else
{
Assert(RelFileNodeEquals(reln->rd_node,
BufferTagLastDirtied[i].rnode));
status = smgrmarkdirty(DEFAULT_SMGR, reln,
BufferTagLastDirtied[i].blockNum);
@ -1492,46 +1405,6 @@ BufferGetBlockNumber(Buffer buffer)
return BufferDescriptors[buffer - 1].tag.blockNum;
}
#ifdef NOT_USED
/*
* BufferGetRelation
* Returns the relation desciptor associated with a buffer.
*
* Note:
* Assumes buffer is valid.
*/
Relation
BufferGetRelation(Buffer buffer)
{
Relation relation;
Oid relid;
Assert(BufferIsValid(buffer));
Assert(!BufferIsLocal(buffer)); /* not supported for local buffers */
/* XXX should be a critical section */
relid = BufferDescriptors[buffer - 1].tag.relId.relId;
relation = RelationIdGetRelation(relid);
Assert(relation);
/* drop relcache refcnt incremented by RelationIdGetRelation */
RelationDecrementReferenceCount(relation);
if (RelationHasReferenceCountZero(relation))
{
/*
* XXX why??
*/
RelationIncrementReferenceCount(relation);
}
return relation;
}
#endif
/*
* BufferReplace
*
@ -1554,8 +1427,8 @@ BufferReplace(BufferDesc *bufHdr)
* first try to find the reldesc in the cache, if no luck, don't
* bother to build the reldesc from scratch, just do a blind write.
*/
bufdb = bufHdr->tag.relId.dbId;
bufrel = bufHdr->tag.relId.relId;
bufdb = bufHdr->relId.dbId;
bufrel = bufHdr->relId.relId;
if (bufdb == MyDatabaseId || bufdb == (Oid) NULL)
reln = RelationIdCacheGetRelation(bufrel);
@ -1576,23 +1449,16 @@ BufferReplace(BufferDesc *bufHdr)
if (reln != (Relation) NULL)
{
Assert(RelFileNodeEquals(bufHdr->tag.rnode, reln->rd_node));
status = smgrwrite(DEFAULT_SMGR, reln, bufHdr->tag.blockNum,
(char *) MAKE_PTR(bufHdr->data));
}
else
{
#ifdef OLD_FILE_NAMING
status = smgrblindwrt(DEFAULT_SMGR, bufHdr->blind.dbname,
bufHdr->blind.relname, bufdb, bufrel,
status = smgrblindwrt(DEFAULT_SMGR, bufHdr->tag.rnode,
bufHdr->tag.blockNum,
(char *) MAKE_PTR(bufHdr->data),
false); /* no fsync */
#else
status = smgrblindwrt(DEFAULT_SMGR, bufHdr->blind.rnode,
bufHdr->tag.blockNum,
(char *) MAKE_PTR(bufHdr->data),
false); /* no fsync */
#endif
}
LockBuffer(BufferDescriptorGetBuffer(bufHdr), BUFFER_LOCK_UNLOCK);
@ -1654,18 +1520,22 @@ ReleaseRelationBuffers(Relation rel)
{
Oid relid = RelationGetRelid(rel);
int i;
BufferDesc *buf;
BufferDesc *bufHdr;
if (rel->rd_myxactonly)
{
for (i = 0; i < NLocBuffer; i++)
{
buf = &LocalBufferDescriptors[i];
if (buf->tag.relId.relId == relid)
bufHdr = &LocalBufferDescriptors[i];
if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
{
buf->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
LocalRefCount[i] = 0;
buf->tag.relId.relId = InvalidOid;
bufHdr->tag.rnode.relNode = InvalidOid;
}
else
{
Assert(bufHdr->relId.relId != relid);
}
}
return;
@ -1674,11 +1544,9 @@ ReleaseRelationBuffers(Relation rel)
SpinAcquire(BufMgrLock);
for (i = 1; i <= NBuffers; i++)
{
buf = &BufferDescriptors[i - 1];
bufHdr = &BufferDescriptors[i - 1];
recheck:
if (buf->tag.relId.relId == relid &&
(buf->tag.relId.dbId == MyDatabaseId ||
buf->tag.relId.dbId == (Oid) NULL))
if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
{
/*
@ -1686,9 +1554,9 @@ recheck:
* don't want to delete the relation out from under someone
* who's just trying to flush the buffer!
*/
if (buf->flags & BM_IO_IN_PROGRESS)
if (bufHdr->flags & BM_IO_IN_PROGRESS)
{
WaitIO(buf, BufMgrLock);
WaitIO(bufHdr, BufMgrLock);
/*
* By now, the buffer very possibly belongs to some other
@ -1697,8 +1565,8 @@ recheck:
goto recheck;
}
/* Now we can do what we came for */
buf->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
ClearBufferDirtiedByMe(i, buf);
bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
BufferDirtiedByMe[i - 1] = false;
/*
* Release any refcount we may have.
@ -1707,11 +1575,11 @@ recheck:
* probably wrong. I added the Assert to find out --- tgl
* 11/99.
*/
if (!(buf->flags & BM_FREE))
if (!(bufHdr->flags & BM_FREE))
{
/* Assert checks that buffer will actually get freed! */
Assert(PrivateRefCount[i - 1] == 1 &&
buf->refcount == 1);
bufHdr->refcount == 1);
/* ReleaseBuffer expects we do not hold the lock at entry */
SpinRelease(BufMgrLock);
ReleaseBuffer(i);
@ -1720,9 +1588,19 @@ recheck:
/*
* And mark the buffer as no longer occupied by this rel.
*/
BufTableDelete(buf);
BufTableDelete(bufHdr);
}
else
{
Assert(bufHdr->relId.relId != relid ||
(bufHdr->relId.dbId != MyDatabaseId &&
bufHdr->relId.dbId != InvalidOid));
if (RelFileNodeEquals(rel->rd_node,
BufferTagLastDirtied[i - 1].rnode))
BufferDirtiedByMe[i - 1] = false;
}
}
SpinRelease(BufMgrLock);
}
@ -1741,14 +1619,19 @@ void
DropBuffers(Oid dbid)
{
int i;
BufferDesc *buf;
BufferDesc *bufHdr;
SpinAcquire(BufMgrLock);
for (i = 1; i <= NBuffers; i++)
{
buf = &BufferDescriptors[i - 1];
bufHdr = &BufferDescriptors[i - 1];
recheck:
if (buf->tag.relId.dbId == dbid)
/*
* We know that currently database OID is tblNode but
* this probably will be changed in future and this
* func will be used to drop tablespace buffers.
*/
if (bufHdr->tag.rnode.tblNode == dbid)
{
/*
@ -1756,9 +1639,9 @@ recheck:
* don't want to delete the database out from under someone
* who's just trying to flush the buffer!
*/
if (buf->flags & BM_IO_IN_PROGRESS)
if (bufHdr->flags & BM_IO_IN_PROGRESS)
{
WaitIO(buf, BufMgrLock);
WaitIO(bufHdr, BufMgrLock);
/*
* By now, the buffer very possibly belongs to some other
@ -1767,18 +1650,24 @@ recheck:
goto recheck;
}
/* Now we can do what we came for */
buf->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
ClearBufferDirtiedByMe(i, buf);
bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
BufferDirtiedByMe[i - 1] = false;
/*
* The thing should be free, if caller has checked that no
* backends are running in that database.
*/
Assert(buf->flags & BM_FREE);
Assert(bufHdr->flags & BM_FREE);
/*
* And mark the buffer as no longer occupied by this page.
*/
BufTableDelete(buf);
BufTableDelete(bufHdr);
}
else
{
Assert(bufHdr->relId.dbId != dbid);
if (BufferTagLastDirtied[i - 1].rnode.tblNode == dbid)
BufferDirtiedByMe[i - 1] = false;
}
}
SpinRelease(BufMgrLock);
@ -1917,22 +1806,22 @@ FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
{
Oid relid = RelationGetRelid(rel);
int i;
BufferDesc *buf;
BufferDesc *bufHdr;
if (rel->rd_myxactonly)
{
for (i = 0; i < NLocBuffer; i++)
{
buf = &LocalBufferDescriptors[i];
if (buf->tag.relId.relId == relid)
bufHdr = &LocalBufferDescriptors[i];
if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
{
if (buf->flags & BM_DIRTY)
if (bufHdr->flags & BM_DIRTY)
{
if (FlushBuffer(-i - 1, false) != STATUS_OK)
{
elog(NOTICE, "FlushRelationBuffers(%s (local), %u): block %u is dirty, could not flush it",
RelationGetRelationName(rel), firstDelBlock,
buf->tag.blockNum);
bufHdr->tag.blockNum);
return -1;
}
}
@ -1940,14 +1829,18 @@ FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
{
elog(NOTICE, "FlushRelationBuffers(%s (local), %u): block %u is referenced (%ld)",
RelationGetRelationName(rel), firstDelBlock,
buf->tag.blockNum, LocalRefCount[i]);
bufHdr->tag.blockNum, LocalRefCount[i]);
return -2;
}
if (buf->tag.blockNum >= firstDelBlock)
if (bufHdr->tag.blockNum >= firstDelBlock)
{
buf->tag.relId.relId = InvalidOid;
bufHdr->tag.rnode.relNode = InvalidOid;
}
}
else
{
Assert(bufHdr->relId.relId != relid);
}
}
return 0;
}
@ -1955,22 +1848,20 @@ FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
SpinAcquire(BufMgrLock);
for (i = 0; i < NBuffers; i++)
{
buf = &BufferDescriptors[i];
bufHdr = &BufferDescriptors[i];
recheck:
if (buf->tag.relId.relId == relid &&
(buf->tag.relId.dbId == MyDatabaseId ||
buf->tag.relId.dbId == (Oid) NULL))
if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
{
if (buf->flags & BM_DIRTY)
if (bufHdr->flags & BM_DIRTY)
{
PinBuffer(buf);
PinBuffer(bufHdr);
SpinRelease(BufMgrLock);
if (FlushBuffer(i + 1, true) != STATUS_OK)
{
elog(NOTICE, "FlushRelationBuffers(%s, %u): block %u is dirty (private %ld, global %d), could not flush it",
RelationGetRelationName(rel), firstDelBlock,
buf->tag.blockNum,
PrivateRefCount[i], buf->refcount);
bufHdr->tag.blockNum,
PrivateRefCount[i], bufHdr->refcount);
return -1;
}
SpinAcquire(BufMgrLock);
@ -1981,20 +1872,26 @@ recheck:
*/
goto recheck;
}
if (!(buf->flags & BM_FREE))
if (!(bufHdr->flags & BM_FREE))
{
SpinRelease(BufMgrLock);
elog(NOTICE, "FlushRelationBuffers(%s, %u): block %u is referenced (private %ld, global %d)",
RelationGetRelationName(rel), firstDelBlock,
buf->tag.blockNum,
PrivateRefCount[i], buf->refcount);
bufHdr->tag.blockNum,
PrivateRefCount[i], bufHdr->refcount);
return -2;
}
if (buf->tag.blockNum >= firstDelBlock)
if (bufHdr->tag.blockNum >= firstDelBlock)
{
BufTableDelete(buf);
BufTableDelete(bufHdr);
}
}
else
{
Assert(bufHdr->relId.relId != relid ||
(bufHdr->relId.dbId != MyDatabaseId &&
bufHdr->relId.dbId != InvalidOid));
}
}
SpinRelease(BufMgrLock);
return 0;

21
src/backend/storage/buffer/localbuf.c

@ -16,7 +16,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/localbuf.c,v 1.30 2000/04/12 17:15:34 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/localbuf.c,v 1.31 2000/10/18 05:50:15 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -60,7 +60,8 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
/* a low tech search for now -- not optimized for scans */
for (i = 0; i < NLocBuffer; i++)
{
if (LocalBufferDescriptors[i].tag.relId.relId == RelationGetRelid(reln) &&
if (LocalBufferDescriptors[i].tag.rnode.relNode ==
reln->rd_node.relNode &&
LocalBufferDescriptors[i].tag.blockNum == blockNum)
{
@ -102,7 +103,7 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
*/
if (bufHdr->flags & BM_DIRTY)
{
Relation bufrel = RelationIdCacheGetRelation(bufHdr->tag.relId.relId);
Relation bufrel = RelationIdCacheGetRelation(bufHdr->relId.relId);
Assert(bufrel != NULL);
@ -120,9 +121,13 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
/*
* it's all ours now.
*
* We need not in tblNode currently but will in future I think,
* when we'll give up rel->rd_fd to fmgr cache.
*/
bufHdr->tag.relId.relId = RelationGetRelid(reln);
bufHdr->tag.rnode = reln->rd_node;
bufHdr->tag.blockNum = blockNum;
bufHdr->relId = reln->rd_lockInfo.lockRelId;
bufHdr->flags &= ~BM_DIRTY;
/*
@ -187,7 +192,7 @@ FlushLocalBuffer(Buffer buffer, bool release)
bufid = -(buffer + 1);
bufHdr = &LocalBufferDescriptors[bufid];
bufHdr->flags &= ~BM_DIRTY;
bufrel = RelationIdCacheGetRelation(bufHdr->tag.relId.relId);
bufrel = RelationIdCacheGetRelation(bufHdr->relId.relId);
Assert(bufrel != NULL);
smgrflush(DEFAULT_SMGR, bufrel, bufHdr->tag.blockNum,
@ -263,7 +268,7 @@ LocalBufferSync(void)
#ifdef LBDEBUG
fprintf(stderr, "LB SYNC %d\n", -i - 1);
#endif
bufrel = RelationIdCacheGetRelation(buf->tag.relId.relId);
bufrel = RelationIdCacheGetRelation(buf->relId.relId);
Assert(bufrel != NULL);
@ -274,7 +279,7 @@ LocalBufferSync(void)
/* drop relcache refcount from RelationIdCacheGetRelation */
RelationDecrementReferenceCount(bufrel);
buf->tag.relId.relId = InvalidOid;
buf->relId.relId = InvalidOid;
buf->flags &= ~BM_DIRTY;
}
}
@ -292,7 +297,7 @@ ResetLocalBufferPool(void)
{
BufferDesc *buf = &LocalBufferDescriptors[i];
buf->tag.relId.relId = InvalidOid;
buf->tag.rnode.relNode = InvalidOid;
buf->flags &= ~BM_DIRTY;
buf->buf_id = -i - 2;
}

47
src/include/storage/buf_internals.h

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: buf_internals.h,v 1.38 2000/10/16 14:52:28 vadim Exp $
* $Id: buf_internals.h,v 1.39 2000/10/18 05:50:16 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -44,27 +44,27 @@ typedef long **BufferBlock;
typedef struct buftag
{
LockRelId relId;
RelFileNode rnode;
BlockNumber blockNum; /* blknum relative to begin of reln */
} BufferTag;
#define CLEAR_BUFFERTAG(a) \
( \
(a)->relId.dbId = InvalidOid, \
(a)->relId.relId = InvalidOid, \
(a)->rnode.tblNode = InvalidOid, \
(a)->rnode.relNode = InvalidOid, \
(a)->blockNum = InvalidBlockNumber \
)
#define INIT_BUFFERTAG(a,xx_reln,xx_blockNum) \
( \
(a)->blockNum = (xx_blockNum), \
(a)->relId = (xx_reln)->rd_lockInfo.lockRelId \
(a)->rnode = (xx_reln)->rd_node \
)
#ifdef OLD_FILE_NAMING
/* If we have to write a buffer "blind" (without a relcache entry),
* the BufferTag is not enough information. BufferBlindId carries the
* additional information needed.
/*
* We don't need in this data any more but it allows more user
* friendly error messages. Feel free to get rid of it
* (and change a lot of places -:))
*/
typedef struct bufblindid
{
@ -72,17 +72,6 @@ typedef struct bufblindid
char relname[NAMEDATALEN]; /* name of reln */
} BufferBlindId;
#else
typedef struct bufblindid
{
char dbname[NAMEDATALEN]; /* name of db in which buf belongs */
char relname[NAMEDATALEN]; /* name of reln */
RelFileNode rnode;
} BufferBlindId;
#endif
#define BAD_BUFFER_ID(bid) ((bid) < 1 || (bid) > NBuffers)
#define INVALID_DESCRIPTOR (-3)
@ -120,7 +109,22 @@ typedef struct sbufdesc
bool ri_lock; /* read-intent lock */
bool w_lock; /* context exclusively locked */
BufferBlindId blind; /* extra info to support blind write */
/*
* This is logical information about relation.
* IT MUST CORRESPOND TO BUFFER TAG!
* If you're going to play with relation file node (ie change relation
* file) then you have to exclusively lock relation, create new one
* (with new relID), make data transformation, flush from pool buffers
* of both files (old and new), flush old relation from cache,
* update relfilenode in pg_class, flush new relation version from
* cache, open it - now you can use relation with new file.
*
* Why we keep relId here? To re-use file descriptors. On rollback
* WAL uses dummy relId - bad (more blind writes - open/close calls),
* but allowable. Obviously we should have another cache in file manager.
*/
LockRelId relId;
BufferBlindId blind; /* was used to support blind write */
} BufferDesc;
/*
@ -187,6 +191,7 @@ extern long *PrivateRefCount;
extern bits8 *BufferLocks;
extern BufferTag *BufferTagLastDirtied;
extern BufferBlindId *BufferBlindLastDirtied;
extern LockRelId *BufferRelidLastDirtied;
extern bool *BufferDirtiedByMe;
extern SPINLOCK BufMgrLock;

4
src/include/storage/relfilenode.h

@ -15,4 +15,8 @@ typedef struct RelFileNode
Oid relNode; /* relation */
} RelFileNode;
#define RelFileNodeEquals(node1, node2) \
((node1).relNode == (node2).relNode && \
(node2).tblNode == (node2).tblNode)
#endif /* RELFILENODE_H */